Code of Maryland Regulations
Title 09 - MARYLAND DEPARTMENT OF LABOR
Subtitle 12 - DIVISION OF LABOR AND INDUSTRY
Chapter 09.12.01 - Board of Boiler Rules
09.12.01.07 - Gas-Fired Installations
09.12.01.07. Gas-Fired Installations
A. A burner in a gas-fired installation shall be tested and certified by the American Gas Association.
B. A gas-fired boiler shall have a vent or flue that terminates at an acceptable location outside the building.
C. The size of the vent or flue shall be:
(1) That recommended by the boiler manufacturer;
(2) At least 4 inches in diameter or equivalent area; and
(3) If the horizontal run exceeds 10 feet, at least 6 inches in diameter or equivalent area.(Regulations .07 adopted effective November 4, 1985 (12:22 Md. R. 2103)
Regulations .07 adopted effective June 1, 1989 (16:10 Md. R. 1106))